Cops pull over a teenage girl with cancer, give her a check for her treatment

(Photo credit: Goffstown Police Dept)

(Photo credit: ​Goffstown Police Dept)

(Photo credit: ​Goffstown Police Dept)

(Photo credit: ​Goffstown Police Dept)

(Photo credit: Elizabeth Kelly Photography)

(Photo credit: ​Elizabeth Kelly Photography)

(Photo credit: ​Elizabeth Kelly Photography)

(Photo credit: ​Elizabeth Kelly Photography)

(Photo credit: ​Elizabeth Kelly Photography)

(Photo credit: ​Elizabeth Kelly Photography)

(Photo credit: ​Elizabeth Kelly Photography)

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Maddie, who is battling a rare type of bone cancer, had no idea that her mom Kathy had teamed up with the officers to give her a special surprise.

Speaking to INSIDE EDITION, Kathy said that the plan came about after a police lieutenant told her one of his officers had collected the donations for Maddie.

Mrs. Carlson thought it would be funny for the officers to pull over Maddie's car to give her the check – and the lieutenant agreed. But when they tried to enact their plan, Maddie was too weak to drive, so her mother was behind the wheel instead and pretended they were heading out to lunch.

"She was shocked and scared," her mother said, laughing. "She's a rule follower."

But then Maddie caught sight of Lieutenant Pierre Pouliot behind the camera. He's a friend of the family so the teenager knew something was up.

"Oh man! It's a prank!" she said, her mom told IE. "She had been so scared!"

When the officers showed her the check, Maddie "had overwhelming joy," her mother said.

"It was so meaningful to her," Kathy said. "This is emotionally really difficult for her so this was a pick-me-up that melted our hearts. To see her smile – that doesn't happen often for us right now."